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it depends on who you're playing against. If it's against a human player, then it's possible to dominate and play even better by relying on the infamous teleport ability of the Nagas to teleport them into the enemy's base. But if it's against AI and you're aiming for speed (the fastest time to complete a map), then I'm definitely in favor of Djinns.
You misunderstood what I meant about heroes.
I meant the following: heroes can be considered half of your army, and the other half of your army consists of the creatures from your castle. That's a rough estimate. So, in previous posts, you mentioned that there's an issue with this "half" of the Haven army – the creatures. But! there's also the other half of the army that complements the first – an army of 2/3/4/5 heroes, and all of this together creates a powerful force. One compensates for the other. A stronger army means slightly weaker magic, and strong magic means a slightly weaker army (creatures of levels 1-4). So, there's a balance. And the heroes in Heroes 4 are very well-balanced.